Multi-CC HARQ Feedback Timing for PUCCH Resource Efficiency
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Solution Overview
Problem
In dynamic spectrum sharing (DSS) systems, scheduling PDSCH reception in multiple component carriers (CCs) with a single DCI leads to inconsistent HARQ information transmission timings across CCs, inefficiently utilizing PUCCH resources.
Innovation Solution
A terminal is equipped with a reception unit to receive control information for scheduling PDSCH reception across multiple CCs and a control unit to determine a unified feedback timing for HARQ information transmission using a feedback timing indicator value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PDSCH reception is scheduled in multiple CCs with a single DCI, then resource utilization efficiency is improved, but HARQ information transmission timing becomes inconsistent across CCs
Solution Approach 1:
The patent introduces a feedback timing indicator field in the DCI that specifies the PUCCH transmission timing for HARQ information. By dynamically adjusting the timing parameter based on the earliest PDSCH reception time across multiple CCs, the system maintains consistent HARQ feedback timing while efficiently scheduling multiple CCs with a single DCI.
2Adaptability or versatility
If HARQ information transmission timing differs between CCs, then flexibility in scheduling is improved, but PUCCH resource utilization efficiency deteriorates
Solution Approach 1:
The patent combines HARQ information from multiple CCs into a single PUCCH transmission by determining a unified feedback timing based on the earliest PDSCH reception time. This merging approach allows the terminal to transmit consolidated HARQ feedback for multiple CCs at the same timing, improving PUCCH resource utilization while maintaining scheduling flexibility through the feedback timing indicator.
Data Source
AI summary
A terminal including: a reception unit configured to receive a piece of control information for scheduling PDSCH reception in multiple CCs from a base station apparatus; and a control unit configured to obtain a feedback timing indicator value from the control information, and to determine a feedback timing for each CC of the multiple CCs by using the feedback timing indicator value.